fix(xhtml,io): align landscape, writeToStream, and file-exists checks with 1.0/3.0

- HtmlTemplate.process(String,Map): pass landscape to buildWhithXhtml
  (3-arg overload); 2-arg ignored it (always portrait)
- TemplateWriter.writeToStream: save the full .docx ZIP via
  wmlPackage.save(output) instead of writing document.xml text (was not
  a valid docx)
- PackageWriter.writeToDocx/Html/PDF(File): drop the inverted
  Assert.isTrue(outFile.exists()) so writing a NEW file succeeds (was
  failing on fresh output files)
338 core + 33 xhtml tests green.

Author: loong10k

easydoc-core/src/main/java/io/github/easy4j/doc/io/WordprocessingMLPackageWriter.java

@@ -106,7 +106,6 @@ public File writeToDocx(WordprocessingMLPackage wmlPackage, String outPath) thro
 	 * @throws Docx4JException ： Docx4j异常
 	 */
 	public File writeToDocx(WordprocessingMLPackage wmlPackage, File outFile) throws IOException, Docx4JException {
-		Assert.isTrue( outFile.exists() , " outFile is not founded !");
 		writeToDocx(wmlPackage, new FileOutputStream(outFile));
 		return outFile;
 	}
@@ -165,7 +164,6 @@ public File writeToHtml(WordprocessingMLPackage wmlPackage, String outPath) thro
 	 */
 	public File writeToHtml(WordprocessingMLPackage wmlPackage,File outFile) throws IOException, Docx4JException {
 		Assert.notNull(wmlPackage, " wmlPackage is not specified!");
-		Assert.isTrue( outFile.exists() , " outFile is not founded !");
 		OutputStream output = null;
         try {
         	String imageTargetUri = Docx4jProperties.getProperty(Docx4jConstants.DOCX4J_CONVERT_OUT_HTML_IMAGETARGETURI, "images");
@@ -238,7 +236,6 @@ public File writeToPDF(WordprocessingMLPackage wmlPackage,String outPath) throws
 	 * @throws Docx4JException ： Docx4j异常
 	 */
 	public File writeToPDF(WordprocessingMLPackage wmlPackage,File outFile) throws IOException, Docx4JException {
-		Assert.isTrue( outFile.exists() , " outFile is not founded !");
 		writeToPDF(wmlPackage, new FileOutputStream(outFile));
 		return outFile;
 	}

easydoc-core/src/main/java/io/github/easy4j/doc/io/WordprocessingMLTemplateWriter.java

@@ -79,22 +79,11 @@ public static void writeToFile(WordprocessingMLPackage wmlPackage,File outFile)
 		writeToStream(wmlPackage, new FileOutputStream(outFile));
 	}
 
-	public static void writeToStream(WordprocessingMLPackage wmlPackage,OutputStream output) throws IOException, Docx4JException {
+	public static void writeToStream(WordprocessingMLPackage wmlPackage, OutputStream output) throws IOException, Docx4JException {
 		Assert.notNull(wmlPackage, " wmlPackage is not specified!");
 		Assert.notNull(output, " output is not specified!");
-		InputStream input = null;
-		try {
-			//Document对象
-			MainDocumentPart document = wmlPackage.getMainDocumentPart();	
-			//Document XML
-			String documentXML = XmlUtils.marshaltoString(wmlPackage);
-			//转成字节输入流
-			input = IOUtils.toBufferedInputStream(new ByteArrayInputStream(documentXML.getBytes()));
-			//输出模板
-			IOUtils.copy(input, output);
-		} finally {
-			IOUtils.closeQuietly(input);
-		}
+		// .docx 是 ZIP 容器：保存整个包而不是把 XML 文本写入文件（与 1.0.x/3.0.x 对齐）
+		wmlPackage.save(output);
 	}
 
 	public void writeToWriter(WordprocessingMLPackage wmlPackage,Writer output) throws IOException, Docx4JException {

easydoc-xhtml/src/main/java/io/github/easy4j/doc/xhtml/WordprocessingMLHtmlTemplate.java

@@ -128,8 +128,9 @@ public WordprocessingMLPackage process(InputStream template, Map<String, Object>
 	 */
 	@Override
 	public WordprocessingMLPackage process(String template, Map<String, Object> variables) throws Exception {
-		// 返回WordprocessingMLPackage对象
-		return wordMLPackageBuilder.buildWhithXhtml(template, altChunk);
+		// 返回WordprocessingMLPackage对象（3 参重载传入 landscape，与 3.0.x 行为一致；
+		// 原 2 参重载忽略 landscape，String 路径总产出纵向文档）
+		return wordMLPackageBuilder.buildWhithXhtml(template, landscape, altChunk);
 	}
 
 	public DocumentHandler getDocHandler() {